Crushing and pulverizing mill.



No. 742,982 PATENTED NOV. 3, 1903. E. C. GRIFFIN.

GRUSHING AND PULVERIZING MILL.

APPLICATION FILED NOV. 14, 1899.

no MODEL. 2 SHEETS-SHEET 1.

W883; lav/m7? z m ac ny THE NORRIS PETERS co puoroumon wAsums'mu, o. c.

No. 742,982. I PATENTED NOV. 3,1903."

0. GRIFFIN.

GRUSHING. AND PULVBRIZING MILL.

I APPLICATION FILED N-0V.14, 1899. V no MODEL. z SHEETS-SHEET 2'.

. E 1mg nu: Noam PETERS 00., morauma, wxsumomn, a. c

1vo.74a,ese. 1

UNITED STATES Patented November 3, 1963.

PATENT GFF CE.

EDWIN O. GRIFFIN, OF NEWTON, MASSACHUSETTS.

CRUSHING AND P ULVERIZING MILL.

SPECIFICATION forming part of Letters Patent Fla-742,982, dated November 3, 1903.

Application filed November 14. 1899- Serial No. 736,921., (No model.)

To all whom, it may concern:

Be it known that I, EDWIN C. GRIFFIN, a subject of the Queen ofGreat Britain, residing at Newton, in the county of Middlesex and State of Massachusetts, have invented an Improvement in Crushing and Pulverizing Mills, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

This invention has for its object the production of novel and improved apparatus for crushing and pulverizing rock, ore, and other hard and refractory material; and it relates to that type of apparatus wherein the material to be reduced is crushed and pulverized by or through the action of a roll or rolls rolling upon the inner surface of an annular or ring die.

In my present invention the crushing-roll is freely movable around the die, and it is caused to travel about the latter by driving meansin frictional rolling contact only therewith.

Various novel features and details of construction of myinvention will be hereinafter described in the specification and particularly pointed out in the following claims.

Figure 1 is a partial transverse sectional View on the line m m Fig. 2, of a crushing and'pulverizing mill, illustrating one embodiment of my invention. Fig. 2 is a vertical longitudinal section thereof on the irregular line w as, Fig. 1, the rolls being shown in the position assumed when the apparatus is in operation. Fig. 3 is a view in side elevation of one of the annular members of the roll driving means. Fig. 4. is a perspective View of a crushing-roll suitable for use in connection with the form of mill herein shown; and Fig. 5 is a similar view of one of the drivingrolls, to be hereinafter referred to.

Referring to Figs. 1 and 2, I have shown a heavy bed plate or base A as provided with an upright substantially circular wall A of sufficient width to contain the crushing or pulverizing mechanism, said ring forming the top, bottom, and side walls of a pulverizing-chamber, the ends of said chamber being closed by preferably metallic plates A suitably attached to upturned flanges a of the curved part A, as by bolts a Fig. 1.

A strengthening-rib A is formed on the exterior of the circular wall A, and the latter is interrupted on each side of the rib to form two outlet-openings A and inlets A one opening and one inlet being shown in Fig. 2, the wall A at the upper edge of the openings A being upwardly extended and rearwardly inclined, in the present instance of my invention at A while the part of the wall A forming the bottom of the chamber is extended upward from the lower edge of the openings A as at A substantially in a direction tangential to the path of the pulverized material, as will be described, and preferably on a curve which is an evolute of the circle formed by the wall A.

A hopper H is attached to the upturned wall A at its outer face and straddles the rib A, the hopper being provided with discharge-openings h, (see Fig. 2,) one at each side of the rib, to direct the material from the hopper E into a secondary hopper 1-1 the outlets of which are the openings A The mouth of this hopper opens into the chamber A formed by the wall A the upward continuations of the end plates A and a curved cover-plate A, which is bolted at its upper end to the flange a of theupturned wall A and at its lower end is secured to a part of the discharge spout or conduit A which leads ed, as will be seen in Fig. 2, from the outer side of the directing-wall A.

Thisdirectingwall has a foraminous or perforated continuation, herein shown as a suitable screen S,

extending from the upper edge of the directing wall A to the shouldered portion ,a of the upturned wall A to which it is bolted at 3, the foraminous portion being shown in Fig. 2 as conforming substantially to the curvature of the cover-plate A where- .by a secondary chamber A is formed, communicating at its lower end with the discharge or outlet A I have herein shown as secured to the inner circumference of'the circular wall or.

'roo

A so that the material to be pulverized, fed into the hopper H, will pass into the auxiliary hopper H and thence, as will be hereinafter described, to the interior of the stationary die at each side thereof through the open hopper-bottom or delivery-openings A A shaft C is herein shown as passed through the die at right angles to the upright plane thereof and coincident with its axial center, said shaft being supported in suitable bearings O secured to or forming part of standards A rigidly attached to the' main frame of the mill, said shaft having, as herein shown, a suitable pulley O thereon by which rotation is transmitted to the shaft, it being manifest from Fig. 1 that the bearings are entirely outside of the pulverizing-chamber, and hence not subject to rapid deterioration from the fine dust and grit always present in the latter when the mill is in operation. Any

, suitable means of rotation for the shaft other internal diameter of the die D, as clearly shown in Figs. 1 and 2.

"lhe crushing and pulverizing material to be reduced is crushed primarily by the action of one or more crushing-rolls R, (best shown in Figs. 2 and 4,) herein shown as cylinders of such a diameter as to be movable radially between the face of the die D and the shaft 0, and I have shown in Fig. 2 three of such crushing-rolls R R R the rolls being shown in the positions they would occupy whenthe mill is in operation, means being provided to move the crushing-rolls bodily around the die, centrifugal force acting to direct the rolls outward against the internal annular die-face. The rolls, as will be noticed, are freely supported to travel upon the die-face, and they are laterally movable within limits, the parallel faces of the rings D at each end of a roll directing it back to its proper track should it be moved laterally by any cause. Each crushing-roll is driven by engagement with a driving-roll or driver in rolling surface contact with the crushing-roll, and, referring to Fig. 2, each driver M M M is shown as in contact with its particular crushing-roll.

The driving-roll, referring to Fig. 5; is of 'sufiticient length to extend beyond the fixed die at each side thereof and to engage and roll upon the rotatable dies D and to prevent lateral movement of the driving-rolls I preferably reduce their projecting ends, as at i m, to form shoulders m, the reduced ends m being engaged by the internal faces of the dies D The material is not only crushed by the cooperation of the crushing roll or rolls and the fixed die, but also by the cooperation of the driving roll or rolls and the rotatable dies D as obviously the rolls M will be thrown out ward by centrifugal force, as are the crushing-rolls, so that a fixed and a rotatable diesurface is presented to be acted upon by the several driven and driving rolls, respectively.

While I have shown three pairs of rolls herein my invention is not restricted thereto, as one or more pairs may be employed. So, too, the shape of both the driving and the driven rolls may be varied, but it is manifestly desirable to have the driving-roll of such a shape or construction as will cause it to track and remain in proper position upon and relative to its rotating circular actuator viz., the ring or die D in the present instance.

The rotation of the dies D in the direction of the arrow 20, Fig. 2, causes axial rotation of the driving-rolls in the direction of the arrows 30, Fig. 2, and such rotation of each driving-roll causes axial rotation of its fellow crushing-roll, as shown by the arrows 40, and the crushing-rolls are thereby made to travel bodily upon the face of the annular die D about its axial center.

The engagement of the annular or circular actuators with the driving-rolls and of the latter in turn with the crushing-rolls is purely a rolling surface contact, and the driving and driven rolls will have a planetary motion imparted thereto, so that material passing to the interior of the die or dies will be caught between the rolls and the dies and properly crushed or pulverized by the rolling grinding motion of the parts one upon the other.

By having only a rolling motion of one part of the grinding apparatus upon another it will be manifest that the friction of the apparatus is greatly reduced and that it is enabled to do its maximum work with a minimum of power.

In order to readily introduce the material to the interior of the die, the peripheries of the rings D are provided with inwardly-directed channels (1 (see Fig. 3,) preferably inclined also relative to the axis of the die, the material passing from the delivery-outlets of the hopper H to these channels 61 from which it is conveyed to the interior of the fixed die, it being plain from Fig. 1 that the innermost ends of said channels are within the inner circumference of the fixed die. As the material is worked upon and driven from the fixed die by the action of the crushing-rolls itis then caught by the rotatable dies D and crushed by the action of the driving-rolls M thereupon. The material thus acted upon passes out into the pulverizing-chamber and is driven therefrom through the outlet A by means of fans or blades F, which are shown as bolted or otherwise secured to the external portions of conduit A while the material which has not been pulverized sufficiently fine to pass through the screenwill be thrown upward, and by hitting against either the screen or the inner face of the wall A will be directed:

thereby down into the open mouth of the second hopper H to be again returned to the interior of the die to be further treated.

The planetary motion imparted to a pair of rolls-that is to say, a crushing-roll and its cooperating driving-roll-will be most clearly seen from an inspection of Fig. 2, for the rolling engagement of a die D with one of the driving-rolls not only rotates the latter axially, but carries the said roll forward in the direction of rotation of the die, and the drivingroll thus presses upon its. fellow crushingroll and not only rotates the crushing-roll axially, but tends to and does move it forward bodily, the latter rolling radially upon the track formed by the inner face of the fixed annular die, the faster the speed of rotation of the die D or, as it has been hereinafter termed, the circular actuator, the greater the outward pressure of the crushing roll or rolls upon the die due to centrifugal force.

The construction herein shown is simple, readily constructed, very strong, and easily repaired when necessary, and by the reduction of friction in the operating parts of the milland consequent minimum running power required the efficiency of the mill is brought up to a very high point.

I have herein shown one practical embodiment of my invention, without attempting, however, to show the various modifications or changes which might be made in the construction or arrangement thereof without departing from the spirit and scope of my invention.

Having described my invention, what I claim, and desire to secure by Letters Patent,

1. In an apparatus of the class described, cooperating fixed and rotatable annular dies, and a pair of operatively-contacting crushing-rolls to travel upon the dies, operation of the rotatable die imparting planetary rolling motion to the said rolls.

2. In an apparatus of the class described, cooperating fixed and rotatable annular dies, arranged in axial alinement, and a pair of crushing-rolls in engagement therewith respectively and with each other, rotation of the Zmovable die efiecting rolling motion of the rolls upon the dies and upon each other.

3. In an apparatus of the class described, cooperating fixed and rotatable annular dies located in axial alinement and side by side,

and one or more pairs of crushing-rolls, the

rolls of a pair contacting respectively with the dies and with each other, operation of the rotatable die imparting planetary movement to a pair of rolls, whereby they roll upon each other and also upon and bodily'around the dies.

4. In an apparatus of the class described, a fixed annular die, a rotatable crushing-roll adapted to roll thereupon, a cooperating driving-roll, and means to peripherally support and move said driving-roll bodily in a circular path, whereby travel of the crushingroll about the die is effected. r

5. In an apparatus of the class described, an upright, fixed annular die, two rotatable annular dies at opposite sides of and in axial alinement with the fixed die and movable in unison, a driving and a driven roll, in peripheral contact, the former engaging and being actuated by the rotatable dies and the latter engaging the fixed die and being rotatably and bodily moved by the driving-roll. 6. In an apparatus of the class described, a fixed annular die, a pairof contacting rolls one of which is adapted to roll upon the curved face of the die, and an annular rotatable actuator for and in contact with the other roll of the pair, rotating it by frictional contact therewith.

7. In an apparatus of the class described, a

fixed annular die, a rotatable crushing-roll bodily movable around the die and directed against the face thereof by centrifugal force,

and means in rolling contact with the roll, to

effect its rotative and bodily movement, said means comprising a loose roll, and a circular actuator the interior of which contacts with fixed annular die, one or more loose crushing-rolls adapted to travel around the die and be directed toward it by centrifugal force, a

annular actuator for the driving roll or rolls.

9. In an apparatus of the class described, an annular, upright fixed die open at its sides, a pair of rotatable rings, one at each side of and adjacent to the die, a rotatable shaft extended through the latter and to which shaft the rings are secured, one or more rolls adapted to travel around the internal face of the die, and a cylindrical driver for and in rolling engagement with each roll, the ends of the driver engaging and being rotated by frictional contact with the rings, whereby a roll and its driver will be axially rotated and moved bodily around the axis of the die.

10. In an apparatus of the class described, an upright die and cooperating crushing-rolls having a planetary motion within the die, a chamber or casing inclosing thesaid mechanism and having a curved bottom, a closed hood communicating with the chamber by an exit, and an inlet for thepulverized material, a discharge-opening for the hood, and a solid directing-wall having a screenlike upper end, the wall forming an evolute continuation of the bottom of the chamber, the Wall directing the pulverized material thrown from the chamber upon the screen, large lumps returning by the inlet to the chamber to be again subjected to pulverizing action.

11. A crushing or pulverizing mill, comprisinga fixed upright ring having an internal annular die, one or more free crushing-rolls movable around the die and directed against it by centrifugal force, a rotatable shaft extended through the ring and supported exteriorly thereto, two annular members rigidly secured to the shaft, one at each side of and adjacent the ring and having each an EDWIN G. GRIFFIN.

Witnesses:

JOHN C. EDWARDS, AUGUSTA E. DEAN. 

